Stingray - Season 1 Episode 17
The Big Gun

The Solistans want to take over the world by destroying the west coast of the USA with their attack sub.(big gun 1) Stingray destroys the sub before it can do any damage. Hungry for revenge, the Solistans want to destroy Marineville so they launch Big Gun 2. Marineville survives & Stingray follows it back to its deep sea base & with Marinas help they destroy the Solistans.